insert new bullet point in autoindent mode

Question

with autoindent mode on, when writing a short bullet point on restructuredtext file:

- item one
         ~

Then I press Enter, and I get:

- item one
  ~

but I whould like to quickly by here:

- item one
- 
  ~

so ready to fill my - item two

right now I have to do ESC[enter]i[space][space] before to be ready to write my item two.

After adding the @Ralf vars:

:setlocal comments+=b:-
:setlocal formatoptions+=ro

Here the check of vars values:

:set formatoptions?
     formatoptions=tcqlro
:set comments?
     comments=fb:..,b:-
:print
     - toto

In insert mode, enter add the - but indented

- lkdsj
      ~         <= press Enter
  - qsdfqsdf
           ~    <= press Enter
    - lqkfdjqd
             ~  <= press Enter
      - toto

In normal mode o add the - but indented:

- lkdsj
      ~         <= press o
  -
    ~           # in insert mode but indented

In normal mode O add the - not indented but line above:

- ~             <= 2. item added above
- lkdsj
      ~         <= 1. press O

Answer 1

This works with the options formatoptions and comments.

Create the file .vim/after/ftplugin/rst.vim and add the following lines:

setlocal comments+=b:-
setlocal formatoptions+=ro

For comments, the b:- adds the the dash as a comment character that has to be followed by a blank. See :help 'comments' and :help format-comments

For formatoptions, the r inserts the comment leader when hitting Enter. The o inserts the comment leader on hitting o or O in normal mode. See :help 'formatoptions' and :help fo-table.